388835/aesni-intel_glue.i

   1 __attribute__ ((always_inline)) __attribute__ ((pure))
   2 int cpu_has(unsigned short bit)
   3 {
   4         asm goto ("1: jmp %l[t_no]\n" "2:\n" ".section .altinstructions,\"a\"\n"
   5                   ".balign 4\n" ".long 1b\n" ".long 0\n" ".word %P0\n" ".byte 2b - 1b\n" ".byte 0\n"
   6                   ".previous\n"::"i" (bit)::t_no);
   7         return 1;
   8       t_no:return 0;
   9 }
  10
  11 union thread_xstate {
  12         int swd;
  13         int xstate_bv;
  14 };
  15
  16 void aes_decrypt(union thread_xstate *state)
  17 {
  18         if (fpu_usable()) {
  19                 decrypt();
  20                 return;
  21         }
  22
  23         if (__builtin_constant_p(cpu_has(154)) ? cpu_has(154) : cpu_has(154)) {
  24                 if (state->xstate_bv)
  25                         return;
  26         } else if (cpu_has(24)) {}
  27
  28         if (state->swd)
  29                 asm volatile ("fnclex");
  30 }
  31
  32 void (*funcptr)(void) = aes_decrypt;